"""add dispatch_time columnRevision ID: 5a8040282a1fRevises: 430e5c7bc3aaCreate Date: 2013-07-24 14:37:45.108000"""# revision identifiers, used by Alembic.revision = '5a8040282a1f'down_revision = '430e5c7bc3aa'from alembic import opimport sqlalchemy as sadef upgrade():    op.add_column("TB_ORDER", sa.Column("dispatched_time", sa.DateTime))def downgrade():    op.drop_column("TB_ORDER", "dispatched_time")